Different phenotypes of segmental vitiligo based on a clinical observational study

Area of Science:

• Dermatology
• Genetics
• Clinical Epidemiology

Background:

• Segmental vitiligo and generalized vitiligo are typically considered distinct conditions.
• Limited clinico-epidemiological data exists for segmental vitiligo compared to generalized vitiligo.

Purpose of the Study:

• To investigate the clinical characteristics and lesion distribution patterns in patients with segmental vitiligo.
• To explore the relationship between segmental vitiligo and generalized vitiligo phenotypes.

Main Methods:

• Prospective and retrospective analysis of segmental vitiligo patients.
• Clinical photographs used to evaluate lesion extent and distribution.
• Patient interviews to gather clinical and historical data.

Main Results:

• Identified three phenotypes: unilateral segmental (124 patients), bilateral segmental (3 patients), and mixed segmental/generalized (14 patients).
• Age of onset varied significantly across subgroups (P=0.028).
• Lesions showed a recurring pattern, not strictly dermatomal or Blaschkolinear; associated autoimmune diseases in 11%, family history in 14.9%.

Conclusions:

• Clinical findings suggest segmental and generalized vitiligo are part of a shared disease spectrum.
• Segmental vitiligo may possess a polygenetic etiology.
• Further research is needed to clarify aetiopathological mechanisms for different segmental vitiligo phenotypes.